Demo 1 of 2 in category CubosLocos
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# earth.tcl
#
# Original C++ code by Katja Treiber and Matthias Schmidt.
# See www.cuboslocos.com for the original files.
#
# Modified for Tcl3D by Paul Obermeier 2009/08/30.
# See www.tcl3d.org for the Tcl3D extension.
package require tcl3d
if { ! [tcl3dHaveOsg] } {
tk_messageBox -icon error -type ok -title "Missing Tcl3D module" \
-message "Demo needs the tcl3dOSG module."
proc Cleanup {} {}
exit 1
return
}
# Font to be used in the Tk listbox.
set gDemo(listFont) {-family {Courier} -size 10}
# Window size.
set gDemo(winWidth) 640
set gDemo(winHeight) 480
# Determine the directory and filename of this script.
set gDemo(scriptFile) [info script]
set gDemo(scriptDir) [file dirname $gDemo(scriptFile)]
# Show errors occuring in the Togl callbacks.
proc bgerror { msg } {
puts "Error: $msg\n\n$::errorInfo"
tk_messageBox -icon error -type ok -message "Error: $msg\n\n$::errorInfo"
ExitProg
}
# Print info message into widget a the bottom of the window.
proc PrintInfo { msg } {
if { [winfo exists .fr.info] } {
.fr.info configure -text $msg
}
}
# Idle callback to redisplay the scene.
proc Animate {} {
.fr.toglwin postredisplay
set ::animateId [tcl3dAfterIdle Animate]
}
proc StartAnimation {} {
if { ! [info exists ::animateId] } {
Animate
}
}
proc StopAnimation {} {
if { [info exists ::animateId] } {
after cancel $::animateId
unset ::animateId
}
}
proc CreateCallback { toglwin } {
}
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
# Propagate resize event to embedded OSG window.
tcl3dOsgWindowResize $toglwin [tcl3dOsgGetOsgWin] $w $h
}
proc DisplayCallback { toglwin } {
if { [viewer valid] } {
viewer frame
Update [viewer elapsedTime]
}
$toglwin swapbuffers
}
proc Cleanup {} {
uplevel #0 unset gDemo
uplevel #0 unset gLightPositionUniform
uplevel #0 unset gCloudPositionUniform
viewer -delete
}
proc ExitProg {} {
exit
}
proc SaveOsgToFile {} {
global gDemo
set osgRoot [viewer getSceneData]
set outFile [format "%s.osgt" [file rootname $gDemo(scriptFile)]]
# Create a name on the file system, if running from within a Starpack.
set outFile [tcl3dGenExtName $outFile]
puts "Saving scenegraph to file $outFile"
if { ! [osgDB::writeNodeFile $osgRoot $outFile] } {
puts "Failed to write scenegraph to file $outFile"
}
}
proc CreateWidgets { osgwin } {
global gDemo
frame .fr
pack .fr -expand 1 -fill both
set toglwin .fr.toglwin
togl $toglwin -width $gDemo(winWidth) -height $gDemo(winHeight) \
-double true -depth true -alpha true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::gDemo(listFont) -height 3
label .fr.info
grid $toglwin -row 0 -column 0 -sticky news
grid .fr.usage -row 1 -column 0 -sticky news
grid .fr.info -row 2 -column 0 -sticky news
grid rowconfigure .fr 0 -weight 1
grid columnconfigure .fr 0 -weight 1
wm title . "Tcl3D demo: CubosLocos tutorial PlanetEarth"
wm protocol . WM_DELETE_WINDOW "ExitProg"
bind . <Key-Escape> "ExitProg"
bind . <Key-f> "SaveOsgToFile"
# Propagate key and mouse events to embedded OSG window.
bind . <KeyPress> "tcl3dOsgKeyPress $toglwin $osgwin %N"
tcl3dOsgAddTrackballBindings $toglwin $osgwin
.fr.usage insert end "Key-Escape Exit"
.fr.usage insert end "Key-f Save SceneGraph to file"
.fr.usage insert end "Mouse Trackball"
.fr.usage configure -state disabled
}
#
# Start of tutorial specific code.
#
proc CreateEarth {} {
global gLightPositionUniform gCloudPositionUniform
global gDemo
osg::Geode sphere
sphere addDrawable [osg::ShapeDrawable dr [osg::Sphere sp [osg::Vec3] 1]]
set sphereStateSet [sphere getOrCreateStateSet]
osg::Program programObject
set vertexObject [osg::Shader vertShader $::osg::Shader_VERTEX]
set fragmentObject [osg::Shader fragShader $::osg::Shader_FRAGMENT]
programObject addShader $fragmentObject
programObject addShader $vertexObject
set vertFile [tcl3dGetExtFile [file join $gDemo(scriptDir) "earth.vert"]]
set fragFile [tcl3dGetExtFile [file join $gDemo(scriptDir) "earth.frag"]]
$vertexObject loadShaderSourceFromFile $vertFile
$fragmentObject loadShaderSourceFromFile $fragFile
$sphereStateSet setAttributeAndModes programObject $::osg::StateAttribute_ON
# TEXTURES
# EARTH
set imgFile [tcl3dGetExtFile [file join $gDemo(scriptDir) "Data/EarthMap_2500x1250.rgb"]]
set img [osgDB::readImageFile $imgFile]
if { $img eq "NULL" } {
puts "Error reading texture $imgFile"
exit 1
}
osg::Texture2D texture
texture setDataVariance $::osg::Object_DYNAMIC
texture setFilter $::osg::Texture_MIN_FILTER $::osg::Texture_LINEAR_MIPMAP_LINEAR
texture setFilter $::osg::Texture_MAG_FILTER $::osg::Texture_LINEAR
texture setWrap $::osg::Texture_WRAP_S $::osg::Texture_REPEAT
texture setWrap $::osg::Texture_WRAP_T $::osg::Texture_CLAMP
texture setImage $img
# use texture unit 0
$sphereStateSet setTextureAttributeAndModes 0 texture $::osg::StateAttribute_ON
# use texture unit 0
$sphereStateSet addUniform [osg::Uniform uni1 "earth_map" 0]
# CLOUDS
set imgFile [tcl3dGetExtFile [file join $gDemo(scriptDir) "Data/EarthClouds_2500x1250.rgb"]]
set imgClouds [osgDB::readImageFile $imgFile]
if { $imgClouds eq "NULL" } {
puts "Error reading texture $imgFile"
exit 1
}
osg::Texture2D textureClouds
textureClouds setDataVariance $::osg::Object_DYNAMIC
textureClouds setFilter $::osg::Texture_MIN_FILTER $::osg::Texture_LINEAR_MIPMAP_LINEAR
textureClouds setFilter $::osg::Texture_MAG_FILTER $::osg::Texture_LINEAR
textureClouds setWrap $::osg::Texture_WRAP_S $::osg::Texture_REPEAT
textureClouds setWrap $::osg::Texture_WRAP_T $::osg::Texture_CLAMP
textureClouds setImage $imgClouds
# use texture unit 1
$sphereStateSet setTextureAttributeAndModes 1 textureClouds $::osg::StateAttribute_ON
# use texture unit 0
$sphereStateSet addUniform [osg::Uniform uni2 "earth_map_clouds" 1]
# END TEXTURES
set gLightPositionUniform [osg::Uniform lp "light_position" [osg::Vec4]]
$sphereStateSet addUniform $gLightPositionUniform
set gCloudPositionUniform [osg::Uniform cp "cloud_position" [osg::Vec2]]
$sphereStateSet addUniform $gCloudPositionUniform
return sphere
}
proc Update { t } {
global gLightPositionUniform gCloudPositionUniform
set lightSpeed -0.1
set cost [expr {cos ($t * $lightSpeed)}]
set sint [expr {sin ($t * $lightSpeed)}]
$gLightPositionUniform set [osg::Vec4 lpos $cost $sint 0.0 0.0]
$gCloudPositionUniform set [osg::Vec2 cpos [expr {$t/500.0}] 0.0]
}
# Create the viewer and the Tk widgets.
osgViewer::ViewerRef viewer [osgViewer::Viewer]
# set the scene-graph data the viewer will render
osg::Group scene
scene addChild [CreateEarth]
viewer setSceneData scene
viewer setCameraManipulator [osgGA::TrackballManipulator]
if { $argc >= 1 && [lindex $argv 0] eq "-viewer" } {
# Only use the standard OSG viewer window without any Tk widgets.
viewer setUpViewInWindow 50 50 500 400
viewer realize
while { ! [viewer done] } {
viewer frame
Update [viewer elapsedTime]
}
exit 0
}
# Use the OSG viewer inside a Togl widget.
set osgwin [viewer setUpViewerAsEmbeddedInWindow 50 50 500 400]
tcl3dOsgSetOsgWin $osgwin
viewer realize
CreateWidgets $osgwin
PrintInfo [tcl3dOsgGetInfoString]
if { [file tail [info script]] eq [file tail $::argv0] } {
# If started directly from tclsh or wish, then start animation.
update
StartAnimation
}
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